The album contains 10 songs total, all written and composed by Jonghyun himself. Title track "Lonely" features Girls' Generation's Taeyeon, who will be working with Jonghyun again after their S.M. The Ballad duet, "Breath".

Jonghyun's full compilation album will be out April 24 at 6PM KST online, before its physical release on April 25!